Stenciling-machine.



L. R. ROGERS.

STENCIL'ING MACHINE.

APPLICATION FILED MAR. 17. I914.

Patented Aug. 21, 1917.

2 $HEETSSHEET I.

WITNESSES:

m6 If 2% Tommi,

L. R. ROGERS.

STENCILING MACHINE. APPLICATION FILED MAR. 17. 1914.

Patented Aug 21, "1917.

I N V EN T U R: ,2)-

,BY I

2 SHEETS-SHEET 2.

y W a WITNESSES #5 LEE IR. ROGERS, OF CHICAGO, ILLINOIS, ASSIGNOR TO UNDERWOOD TYPEWRITEE COM- PANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

s'rEivcILING-MAcHi vE.

To all whom it may concern:

Be it known that I, LEE R. ROGERS, acitizen of the United States, residing in Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Stenciling-Machines,

' of which the following is a specification.

My invention relates to mimeographs or duplicating machines in which a seriesof work sheets are fed serz'atim to a stencil cylinder, the worksheets being fed between the cylinder and the feed roll. In machines of this character, it is customary to supply ink through an inking pad and stencil sheet wrapped on the surface of the cylinder for printing on the work sheets as they are fed over the cylinder. When the supply of work sheets is exhausted, or if for any other reason the sheets are not supplied to the cylinder, the feed roll is aptto run directly in contact with the inking portions of the cylinder and becomes smeared with ink whichis transmitted to succeeding work sheets.

The primary object of my invention is to provide simple and effective means to over-' come this objection, and to this end, provision is made for automatically lifting the feed roll from the cylinder whenever the supply of work sheets fails, the mechanism for lifting the feed roll being controlled by the work sheets. The feed roll may be carried by a swinging frame and held against the cylinder by means of a cam or other suitable mechanism held in operative position by a latch. The latch may be released when the supply of work sheets fails, by a trip device which is reciprocated, as by means of an eccentric geared to rotate in unison with the cylinder. When the work sheets are being normally fed forward to the cylinder, the trip device is defiected'by the sheets to an inoperative position, but whenever the device for actuating the latch.

illustrate one form of my invention, Figure Specification of Letters Patent. Patented Aug. 21, I Application filed March 17, 1914. Serial No. 825,194.

1 is a perspective view of an Underwood revolving duplicator with the present improvements.

Fig. 2 is a view of the latch, and a trip Fig. 3 is a sectional i View of the IllSIIl shown 1n Flg. 2.

and the feed roll lifted from the cylinder. In this View the cam on the cylinder shaft is coming into position to restore the latch, and the work sheet which is'also being fed for ward has just engaged the trip to move it to an ineffective to berestored. a a 1 Figs. 5 and 6 are diagrammatic views of the mechanism shown in Fig. 4,: but with the i 5 F'g. 4 is a part sectional side elevation View showing the latch in released position,

position, and permit the latch parts in different positions. Fig. 5 shows the cylinder advanced beyond the point at which the cam has restored the pressure roll, and the latch in holding position. Fig.

6. shows the position of parts with the supply of work sheets exhausted,and just after i the trip device has operated to release the latch.

Theusual stencil cylinder I mounted on an axle 2 is rotated either manually or otherwise. A gear wheel 3 is rotatable with the cylinder, and through an intermediate pin-' ion 4, rotates a gear wheel 5 fixedto @1101- low sleeve 0r axle 6 to which are secured paper feeding segments 7. The gears 3, 4, and 5 are preferably of the same diameter so that each rotationof the cylinder i1nparts a complete rotation to each gear and also to the feeders 7. The axle 6may be.

mounted on a tie rod 8, connected to. swinging arms 9 to form aswinging frame for lifting the feeders 7 away from the work sheets 10. The pile of work sheets. 10 is i 5 supported on a table 11 pressed upward by springs, (not shown), so that the upper-w most sheet is in position to be moved for--.

ward when engaged by the feeders 7. Side gages 12, and a rear gage l3 bear against the edges of the work sheets, and are adjustable to accommodate'sheets of different sizes. 3

At eachrotation, the feeders 7] frictionally engage a work sheet 10 and feed it forward, 1

until the-leading edge isgripped between the rotating stencilcylinder land a feed roll 14;, which may be the usual soft rub berfeed roll supported on arms15 connected at'their forward ends to pivots 16. The free ends of the""'arms' connected bya'cross bar" or roller 17 which-is normally heldup by a cam 18 to cause the roller 14 to bear against the cylinder or the work sheet thereonfi The cam 18 is fixed to a rock shaft 19, to wh ch is also'fixeda rock" arm 20 carryingapiv oted rod 21, extending upward into posi tion to be actuated by a cam 22 adjust-ably secured to'the cylinder axle; 2 as by means-of a 'nut 22; x A spring -23-tends to rotate the,

15*ca1ny18' downwardiinto position to permit the feed roll 14; to drop away from the stem cil' cylinder, but such irotation' of the cam' is normally preventedbya latch 24 pivotedat 25 and :havingra dete-nt to engage a notch'26 gain the holding rod 21, assho'wn in'Fig. 5.

Therod I21is supported and guided by a guide-roll 27 on the'machine frame,

.Di'iri'ng the" normal. operation 'of the machine, the latch--24 :remains ,inengagement 25' withthe rod"21,'and thewfeed rollrlais maintaine'dinoperative-position. hen-however,-

' the'isupply-ofwork sheets 10 is exhausted; or

for any 'otherreason the'feleders 7 fail to ad-- vance a sheet to the cylinder,tl 1e-latch 2 'is released to permittheifeedroll-l to drop,

and" thereby I prevent; the roll 1 from becoming smudged' or' daubed withink from the cylinder; The-1mecl1anism for releasing'the latch -isxas follows:

a Securedw to the: inner face of I the gear wheel his an 'eccentric disk 28, which drives airec'centri'c ring 29 having a-dependin-garm 30 adapted to" strike the ;inturned end 31, of an arm 32, projecting from the latch 2 1. 4e-.Each;'rotation of the-gear'FWheel 4E imparts an'up and-down movement to the trip arm 30, :and saidarm is guided during such move ment'by'means of flanges 3?)"011 said arm, embracing'the' end of a'guide rod 34, projecting -downward from a horizontal rock shaft 35 to'whichis also secured-an arm-36, projectingdownwardinto'the path of the work sheets 10. The lower end of the arm 36 may project into a guiding slot 37' formed in a latch 24, permitting the feed roll 14 to be lifted from the cylinder, as before pointed out;

When the arm 36 has been released by a work sheet being carried beyond said arm, it is returned bythe frictional'turning moment applied by the gear at to the shaft 85, the end 0 WlllCh, as shown in Fig. 3, is seated in the hub of said gear. This return movement may also be 'assisted by gravity, or a spring might be used for this purpose, if desired. The movement ceases when the end of arm 36 engages the rear end of the slot. See Fig.2 6.

As' the stencil cylinder rotates after the pressure roll has been released, the cam 22 30 is brought to bear on the anti-friction roll a is held off the cylinder through the greater portion of each rotation; Thus, as shown in Fig-6, the trip 30 has just operated to release thelatch, and as the cam 22 is only a short distance beyond the rod 21, the latter will notbe again depressed to return the pressure roll 14: to the cylinder until the latter has made nearly a complete revolution from the Fig. 6 position.

vIfthe movement of the cylinder is continned through one or more revolutions after the Work sheets are exhausted, the latch mechanism will be reset during each revolution, and the pressure roll permitted to run on the cylinder during a fraction of a revolution. The'portionof the cylinder,

however, with'which the pressure roll is thus engaged, is not supplied with ink, being in advance of that portion of the stencil sheet or surface through which ink is supplied to the work sheets. The feed roll is thus at all timeskept free from the inking surface.

Variations may be resorted to within the scope of the invention,and portions of the improvements may be used without others.

Having thus described my invention, 1' claim: I

1. In a stenciling machine, in combination means comprising. a latch to hold the feed roll in operative position, a trip device geared to the cylinder and operated during each rotation of the cylinder, a guide for said trip to cause it to move into position to release the latch and thereby cause the feed roll to -be lifted from the cylinder, anda deflecting arm connected to said guide and projecting into the path of the work-sheets whereby the trip device is deflected to inoperative position, 3 and thus prevented from releasing said latchexcept upon the failure of the feeding mechanism to advance a work-sheet. I

2. Ina stencilingsmachine, the combinationwith a stencil cylinder, a feed roll runto hold the feed roll on the cylinder, a trip feeding mechanism,'mechanism comprising ning thereon, and mechanism tofeed a series of work-sheets serial/fem to the cylinder and feed roll, ofa swinging frame carrying said roll, a cam to move said frame into position to hold the roll against the cylinder, a holding latch to hold the cam in said-position,

a trip, armfto release the latch, means geared to the cylinder to actuate the trip arm durtion witha stencil cylinder and alfeed roll running thereon, of mechanism comprising a latch for holding the feed roll against the cylinder, sheet-feeding devices geared to the.

cylinder to receive one completerotation and advance a work-sheet each time the cylinder is rotated, an eccentric connected to rotateiin unison iththe stencil cylinder,a trip arm connected to said eccentric, and movable thereby into position to trip said latclnand a deflector connected to said trip arm and extending into the path of the work-sheetsand operable thereby to deflect the trip arm to inoperative position. v

4, In a stenciling machine, the combination with a stencil cylinder and a feed roll, of sheet-feeding mechanism to advance worksheets to said cylinder and roll, a latch device controlled by the work-sheets and operable to automatically trip the latch and thereby permit the feed roll to move from thescylinder when the supply of Work-sheets fails, and means to automatically restore the feed roll and latch to operative position when work again passes.

5 In a stenciling machine, the combination with a stencil cylinder and a feed roll, of a latch and means cooperating therewith to hold the feed roll against the cylinder, means to release said latch, and, a camconnected to the cylinder and operable ata predetermined period in the rotation of the cylinder to restore thelatch cooperating means.

6. In a stenciling machine, in combinationa stencil cylinder and a feed roll, of sheetalatch and mechanism cooperating therewith, for holding the feed roll in operative position, a trip to release said latch, means operable by the advancing Worksheets to maintain said trip in ineffective position,

and a cam rotatable with the cylinder to automatically restore said latch cooperating mechanismQ v a 7; In a stenciling machine, in combination a stencil cylinder and a feed roll, of means to move the feed rollawayfrom the cylinder, a cam rotating with the cylinder, a holding device in the path of the camfand operable thereby to move the feed roll into engagement with the cylinder, a latch to engage andhold said device when the feed roll is against the cylinder, a trip to release said latch, and meansactuatedby the ad-f vancing work-sheets to move the trip to ineffective position, whereby the latch isper mitted to hold the feed roll against the cylinder While the work-sheets are being fed thereto and said latch is released to permit separation of the feed roll from the cylinder when the, supply of work-sheets fails.

8. In a stencilingmachine in combination, a 'stenciling cylinder and a feed roll coopeiw atlng therewith, means for feeding sheets one by one between the two, pivot arms to carry said feed roll, means for moving said arms to bring thefeed roll into operative position in relation to the stencil cylinder,

a latch to hold said supporting arms with the feed roll in operative position, a roll geared to said stencil roll and means oncthe geared roll to occasion withdrawal of the supporting arms when a sheetfails to pass. 9. The combination with a rotary cylinder and a feed roll running thereon, of means for feeding sheetmaterial to said cylinder and, roll, a supporting device for said roll, a. latch to hold said device in position to hold the roll against the cylinder, an intermittently operated trip adapted at each operation to trip the latch and permit said roll to be separated from the cylinder, means to automatically restore the latch and roll, and means on the cylinder shaft operated by the sheet material to deflect said trip at each operation of the trip to an ineffective position, whereby the release of the latch is prevented during the normal feeding of the sheet material to the cylinder, the tripping of the latch being permitted when there is a lapse in the supply of sheet material to the cylinder;

. 12G? 10. The combination with a rotary cylinder and a feed roll, of means for feeding work-sheets to said cylinder and roll, means to support the feed roll, a latch normally holding said supporting means in position to retain thefeed roll in running contact with the. cylinder, a latch-releasing trip,

means to intermittently operate the trip for releasing the latch, meansoperated by the advancing work sheets to render the operation'ofthe trip ineffective to release the latch during the normal supply of worksheets to thefcylinder, and a cam to return said supporting means to'operative position,

; and permit the restoration of the latch, said cam being brou ght intermittently to o ra tive position in alternation v with the Opera 'latclnbeing movable away from the printing' surface, a trip operated intermittently to] release the latch and permit the separation of the roll from the printing surface, means to automatically restore the roll to v the printing surface,'fand means controlled by the work-sheets to prevent' said trip when operated from releasing the latch.

12; In a stenciling machine, thecoinbination with 'a stencil cylinder and a feed roll,

, vor mechanism for feeding worksheets serimm 'to' said cylinder and roll, a, latch to J operative holdfthe f eed roll against the cylinder, a trip to release said latch and permit the feed roll to separate from the cylinder, means to actuate said trip duringeach rotation of the cylinder, means' 'actuated by the worksheets to automatically; deflect v said trip to ineffective position, and means to automatically restoretheroll and latch to 13. In a 'stenciling machine, the 'combina- I tion with "a stencil'cylinder and a feed roll,

atzfm to "said cylinder and roll, a la'tchto hold' the feediroll against the cylinder, a trip for said latch, 'means to reciprocate sa d of mechanism for feeding work-sheets 8671'- trip during each rotation of the 'cylindenla rock shaft, a rod connected to said rock shaft and projecting intoth Pathof the advanclng work-sheets, andfm eans carried'by the rockshaft to deflect the trip to an inefiec tive positioni 'when the Work-sheets are "advanced, so that the reciprocation ofthe trip vis efiective to release the latch'only when thereis a lapse in the adv'a nce of the workhe ts I i '14:. 1he combination with a revoluhle stencil0y1inder ancla feed roll to-run on said cylinder, ofa device for supiperting the feed roll and holding it against the'cylinder,

said feed roll, automatically movable away from the cylinder when notlrestrained said holding-device, af latch to hold said device in operative position with the roll against the cylinder, a sheet feeding device geared to operate n unison w th' the stenl lie randfop r e 9 shee s .6-

. pos t on after the latch has been released by said trip.

riatim to the cylinder, one sheet being advanced to the cylinder at each'revolution of the latter, a trip device drivenin unison with the cylinder and actuated at each rotation of the cylinder, said trip device operable to release said latch, and v tripcontrolling means to control the trip and preventthe release of the latch during the normal supply ofthe-worksheets,and permit the trip to, operate the latch upon failure of the sheet-feeding device to advance a work-i sheet.

15. The combination with a revoluble stencil cylinder anda feed roll to run on said said latch, trip-controlling means to conml the trip and prevent the release of the latch during the normal supply of the worksheets, and 'permit the trip to operate the latch upon failure of the sheet-feeding de vice to advance a work-sheet, and a restoring cam rotatable in unison with the cylinderand operable to return said feed-rollsupporting device to operative position and cause the latch to be restored toholding position after it has been released, by thetrip, said cam running free of said feed-roll-supporting device while the feed roll. is rnnning on the cylinder. l i i The combination with a rotary stencil cylinder and a feed roll beneath said cylinder, of a supporting device to hold said feedroll up to the cylinder, a latch to hold the supporting device in operative position, a trip operative to release the latch and permitthe feed roll to drop away from the cylinder, a worksheet-feeding device geared to the cylinder and operable in unison there with to advance a work-sheet to the cylinder at each revolution of the latter, said trip geared tothe cylinder and actuated at each revolution of the cylinder, and trip-controlling means to render the trip inefi'ective when work passes.

17. In a printingdevice, a rotary printing couple, means for feeding sheets to said couple, horizontally pivoted arms, one membe r ofsaid couple being mounted in said arms to swing vertically towardand from the other member, a roller on said arms, a rock shaft, a cam on said rockshaft adapted to engage said roller, an arm on said rock shaft, an upwardly extended rod connected to said arm, a notch in said rod, a latch engaging said notch and a trip operative unless a sheet passes to release said latch and permit the disengagement of the printing couple. a

18. In a printing machine in combination, a printing couple, one member of said couple being mounted in fixed bearings, and the other in retractile bearings, means for holding the two members in printing relation, said means including a latch, a, gear wheel mounted on the shaft of the member in fixed bearings, a second gear wheel in gear with said first mentioned gear wheel, an eccentric on said second gear wheel, a ring mounted on said eccentric, an arm depending from said ring, a rock shaft in line with the shaft of the eccentric carrying gear wheel and in frictional engagement therewith, a downwardly extending guide rod on said rock shaft, said guide rod and said arm being in sliding engagement, a latch having a slot through which said guide rod may go when no work passes, and an arm on said latch topics at this patent maybe obtained for tion, said means including a latch, a gear wheel mounted on the shaft of the member in fixed bearings, a second gear wheel in gear with said first mentioned gear wheel, an eccentric on said second ar wheel, a

ring mounted on said eccentric, an arm depending from said ring, guiding and retracting means in engagement with said arm, an arm on said latch in the normal downward path of movement of said ring arms when no work passes, and means whereby said ring arm is deflected from its normal downward path of movement when work passes so as to avoid the latch arm.

LEE R. ROGERS.

Witnesses P. L. CoMEeYs, A. V. GROVE.

five cents each, by addressing the Commissioner of Patcnta, Washington, D. C. 

